 Notes on lesson on Coordinate Geometry straight line | kullabs.com

#### Circle

This lessons gives us idea about what is equation of circle,its equation in different forms and condition, its center, circumference e.t.c This lessons gives us idea about what is equation of circle,its equation in different forms and condition, its center, circumference e.t.c

#### Straight Lines- Part 1

A straight line is a one-dimensional geometry with no fixed ends.The general equation (linear equation) of first degree in x and y is, $$Ax+By+C=0$$

#### Tangents and Normals to any curve

The tangent is not initiated from circle only but infact from many geometrical figures and it is very inportant to study .

#### Straight Lines - Part 3

The two sides of the line mean the side containing origin and not containing origin.If linesAx1+By1+C andAx2+By2+C have same sign, then P and Q lies on the same side of the lineAx+By+C=0.If linesAx1+By1+C andAx2+By2+C have opposite sign,then P and Q lies on the opposite side of the lineAx+By+C=0.

#### Pair Of Straight Lines

Any two lines through the Origin may be written as y = mx and y = tx where m and t are their gradients(slopes). So (y - mx)(y - tx) = 0 giving y - mx or y - tx = 0 must represent the pair. The homogeneous equation of second degree in x and y is given by, ax^2+2hxy+by^2=0